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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1721cdac7f042e3e76623d7b2d4cfbdc564eb7bb720f42a09a5b229bd24b962' 
  AND token = 'Qh9C5UJ7vvbu+UoRt6crV6pFAJ4czyxTfxm6NBMAUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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