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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beac2e34ca723e959190e19ad654eba8e4a86f3961df8834a36abe05b581fab' 
  AND token = 'V7uAuzxUwARe4FFjx0hd9YlZCWnm0XmmQXA8KauNZPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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