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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a79542fe82abc2d7f0e27cad010efb7892dacd8b3aac44010253592ea543f3' 
  AND token = '33FbD85DbFLK6QWK0M9cXxDUERZoKB3kPSGl3a/Mb+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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