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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b37e3eccfcc7e1cebe39c7ed1eb3b2a6727e655dc0b7c2ab684e4ba70887a4' 
  AND token = 'DQrWn7Ut38dzXuitJlFirlMu3CJKgjWbLEIsNUl5Qas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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