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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3336314421d6ca7ceed286d08d431931c16a09db9670b8b8db48f4ed66fc98' 
  AND token = 'DnBWoo8E0/12MIHIMmHQEwXPeICYpCWRv5j04FnAwyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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