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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23467d7e7109f7eb8b84e822d18a7db10d3bfa8c45e070e5ea132546927d3d35' 
  AND token = 'X37IZx15nZgTl9d54D614VsEDsqmuqJ9ea72XeoB9CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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