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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06692f7066366a6388c290a56034d15d6ae5c96b6f601800726f4bd796de71e3' 
  AND token = 'cCHp7J5XhDOlEWhtmr9EFjnisFM+TcLHGJv6Ln7jQfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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