Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a2033bd84ba94715fafed9e00fc4518701ac434a53cd1f35a0e4ac06c40d7d' 
  AND token = 'a9JrAMcPLRfJGR84IEEMRcbescqJAdhm6rekOf50KLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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