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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24005878c5ee40cf995f6673bf6741bfe0b6d133de17d42413d95071242478ae' 
  AND token = '7a68JvmXn4eY3JdZveYK5O7i2toQacmcGAd/XmKjODk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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