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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c10624d12de9f17175c3f49f718176f77aacf37968055d0ea93d27d6038662' 
  AND token = 'lc5AJYVWZOyIM6VOvbk6x7xiauVqGBVPdkzVShgBF0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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