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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d70ebb3bc8b4834ca700608837a95a8200d30a44eee5476fcba7df9a428c4b' 
  AND token = 'So6mjPkoR0T1oLgZxnws5F9Ut/rcBQds7JxhwaedrMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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