Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15418137d120b066c13c7188f0d434b2513ed68f6751e795a8e986825beeeca9' 
  AND token = 'bYZFctMK72fAe+f2OJgVgDjQg9sQtAkcuwyagqRAkzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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