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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7451193a65ef0a756403808af5d6530563d22a003c9362f6583cae01f1ea36' 
  AND token = 'LPnIva2AUMaujAd6yAxl1M8/0NnLTZ58L0yE036KSdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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