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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b32a0352ae0c25b360a5c275a3ad685e7efe5b9fcf36bd13d9a2e5c33863d5c' 
  AND token = 'vhV5moF9O/2t77qvRT/TXoeKLocTOAM2/jGs33JoOwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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