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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf61583eaf1dd60c832d3a560b22aff44c2a3eada8958a08617d769184884935' 
  AND token = 'RiwxE931V2wRqae15n2UcQo5aFClB2MSazGZlf5mh3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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