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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99e23fbdf3ce3f7808f9920a80dfd42233bdaa66a47466b0d0f930c6839573d' 
  AND token = 'QGTzveVmzEp1P9Xng8uKAx0Tia8psxWBXqEO7OVsW40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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