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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b79addeffc2135169b1694493ed148085a1b8651f32a6a080ef81eca61e9f86' 
  AND token = 'BgU3/NOIeAoj2Gar0f2nPm6oUnTB4Y5LenBxV+zfSto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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