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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191ad9e279a49af0e293f077ab1a32d8cbbe19e33b06edb2a58c79b2a69c17ef' 
  AND token = 'KyUtUAtQyPsxwZWuBkcO91mUUz4D46H0SN9WQEoUgUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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