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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eac5890048fd291f52ecb0d6bc976c1113125dced8169925b61f17aa476567' 
  AND token = 'WvNKYjeKsNVLXuTYi5cQ2VO42iIyf5lY/8ZXQmoxrnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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