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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699e69b79e3c86c749310859c4cf0e9817c0bf82c8c4036a6748ac03af13b68f' 
  AND token = 'qAsoWX/eIBbaDUcu+xx3Ni+deTIYuZPs0tERMsipbQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}