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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a79e92e19d2a6eccc326f85f5a68fe85ea3b06bfd8a54ce44e62e8b9ded7d7' 
  AND token = 'vL1JN7db1FoMg1T7d0JHY7s31HwK44UAy2VYP7MtyfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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