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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0658fe870e76d5efb29ca87d01e8883301ec3cf4028d118aea9de987675f5840' 
  AND token = 'TClHEpH5eljlrAqnAiusEJ1kG9GBGUe5qEhhkYBzX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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