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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31c9dda9c549d00aab98b79a6479519b9a915587b7fb5c06a8d4e4992e442e8' 
  AND token = 'moOsDlwXEM/1JUyHctr/cOerb1Ql088AQxhUu6xhyHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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