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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc59f92d9409a6a8bd53ecc4005cab334968d5875278bd63d9d63b6926ab14e8' 
  AND token = 'K0HGn7UcEEC/Z3GK037+7gdMK/B/+3Enu0NKmd6l46A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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