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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f292da58c3aca567b4b76e47297dd53501f8da6fa6d10dbbdb6fda6d463d6774' 
  AND token = 'Krou5ayRHrn2Y09rnlRrKTeKlWfGJMHQUy2Df23B9ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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