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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c00324c85e957b05830e1a9ab815ca5926bbfe55dcce6cab1b484b5fc2b36c' 
  AND token = 'e87RERPkjcgoOCxI93xTYQ7Cp1V+NddDZq7aFupozXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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