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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441e6400a30049c6e1e1ece68f4416384ecd9374ee10ec1bf095606ce44b860a' 
  AND token = '7zPDqs2m8a7nSrWnZkGOXxbktQMnK0NtcGC9qmnGH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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