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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ae6870873db3c0ee50210331d1901c0d9a8717a1d6d4257deb35fb7716cfb4' 
  AND token = 'ekyOUyuex2YZo3TGWZTSej62ffz2Qn8Xxv07Nw0qmW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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