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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b7b781cec05bef55ca1afded84d371ae06b896eda550ead9664a0acd9044ef' 
  AND token = 'UO4pDCLSGwdOsFHziDKUGh+yco/gjMvmvanDrakSKBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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