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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d7e2017027fda9360b1ff33e8947ffce3f51215a288e9b0dd5c36ccb44a30c' 
  AND token = 'gWTKNOSTDGg1Pm5dnkqz6ecWfUFaWFE7D0PszhfziJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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