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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e58a0654ea6c7aaa12dce97c9d73f93560476f19d5966118c35d802eea8b5f8' 
  AND token = '0EfnMY7freikVdNQUKRmzAQhczkP7odR4roPkxP5WGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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