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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e102395c738d8912b4f88498901ee83facec7a4605d93e9a4d825216ec3afabd' 
  AND token = 'qI1apWNHgy8wLxjzU416sdoW/HMMLn8JhA0cQHqH8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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