SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822b5c9d1a18de32028b87039f13e407021119aa2f3cb9041300c84e85ca6d87' 
  AND token = 'DuDjin++4hmpMOHGL95u4z72/+ngJKhmgYLklF3Ukn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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