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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dbc67e790558889f95b31884f172f4334cb68c33b7508210c520f18bec82e5' 
  AND token = 'Nl8c5DpCia2duN7L7zQ3X7MqPcyjq0v1Safq9c7lmXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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