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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729768e8324919129737ced9cb57e850502ecc90f5afd89a3c7e98f27d47e6d8' 
  AND token = '8ePvJxJGQlNTF8HlXhUZlgX9n8W/86ZpEmsoVEodaTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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