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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1456c1776b138f7038ef86404aa31c1b3706b860b249cc59aa3687cb870d7c45' 
  AND token = 'o/jS2TcVB0IpDCD5UWfWENTVZCToIY9zH3q9lYs68iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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