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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9842c9754edb309f391c193d385bd0f8f90241108b84287cb61de8f8ccc58a20' 
  AND token = 'iW1o2b51qdV5hP7zQTyytcE+CgUIBUi27CJ5NFSdFyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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