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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c574264aff82c6001b65ed0c1fcee0de71165c17179aa6c131d02e79f9b3de' 
  AND token = 'kNlcWtqdHnylMBYTSxYJ0Zxry1tiAgMJGScw8SyEH6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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