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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df8ae6bc7d155b29face41d1b637f896204c2a11737cbab0a4df074c6c8d8d0' 
  AND token = 'UFcaUgO6Ifw6rxa+R3uKhuMCUgRkMYmz8CwnxbyOzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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