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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e9f7f584351270b2f96b5078151b2aeb959283204d04b41cc4fdfbfe1c8888' 
  AND token = 'K7slEa0e83n1VWS12MICoc7S3UWrdu2Hpt78F/y+ng4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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