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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ac44d4d10dbe12071bf01d81814c16e74ad6528711d8a5bab69f5f908f87eb' 
  AND token = '6xGqLOSZXrMm4Sm85h8qYIrQTTUoB3w/are+PCrvl4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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