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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a417ccfcc06bd242c11cb1a979e81567da4b42a7a82cd17865b8bb7bb7d2b7' 
  AND token = 's3jXzSckJexQvqdw5VO1KnhX6LJbk6GeMvpS7Hxxz3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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