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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1648ead8d491c4e55b29c90686c0e86831da4e4277d53e0976b5ac5c6722f085' 
  AND token = 'm220mXxA3zI6WCr9pBhSwoQ0mNwwtr4TEFlR9e0QS5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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