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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe29c5e60fe4d6a00789546fe614eb0a28b8850d62bc68fbbd8cbef823ad9dd' 
  AND token = 'kjdS4k5bFVL2rMO/h3enqT1xqgrLIFnvlAh2uGlMB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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