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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484ce00ae38f10471b609e15ad5379236158e96a310f7a82a38f9fa578b9f074' 
  AND token = 'F36UOrnUZ1jb++1GONdfMaMLamFBmyVXO5ITHzeb6KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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