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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd02f30ebf9ed548123d19666bcef3544554cc56016d918b7d2420db78653edf' 
  AND token = 'JPMCYmiunZTOBc6nJ7Eai/XMyD6vCEGpTkVR3HdibmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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