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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03fe2b6953e65a9bc6812c49a6882b69f90df9c6448cb4f384bb33ac1492960' 
  AND token = '/ANjvN41W+Fs0Qr0Z1XtALbN9uSn320dMSNazONvjds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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