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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b423076a68df842a3b1f34b9f25a1b317ad4364f5d88dde0e07c0adda4218d' 
  AND token = 'orx9TVMRFJFAFKX6Iiw7eSAsZDDiMnAcUuvT+ZxgrrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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