SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0899f8b141c20ef2505d83ba8ecaf0294557476ba705a2e8ce64656a219522c3' 
  AND token = '86D+LfgXljJ34sexvftPOW35/BkVszl+eQZjVqPJ660=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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