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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab841a360d848dba9894a21e73fa4a63fbb54e3ae63e3eb72383c3d0d62b3156' 
  AND token = 'DxS5sMAcT9h/KI13LpGuxifz1QXHRCeF+AF91dtQ0gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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