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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4679d0b9c9ed98fede791707d2d85d0ff4a305d7be2c8b8064931c9e64d6ef09' 
  AND token = 'wqZXwBstdZBkcTm8AxnkqPxNcoqba2MYxiFDMa9J7cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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