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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d55b3760a45ea0bbc56a22bd80e02fa763cbefb9adbe5f51a6e0115cb353c31' 
  AND token = 'r5KtAEF3HjUNdb5KpD/iTSvv4676ELAlsukSgpVy8wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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