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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06874c61eedd5dce86d868e046aae4c880e9d337fa739bce41e4aefc9224736' 
  AND token = 'ouYcXa3RR/OXFiDJ9gDhjHt939NylIPfC/ZHZeB/Iqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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