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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539a89b8f7fe42de1b18c0118322b17e04b9132e58889f960776e4123783cf90' 
  AND token = 'VEJB2MtaucVPwziEE7r4FB/NIYK7KKwVo0QKpHZkufE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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