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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fe31e59c5d348dc38a2fad5cb13cdefeef34fa1998ddceb7805ebdf09c603a' 
  AND token = 'rhDV4Qsp05VM/YhZZW1M2jXeaE5v39x0UYfsoSG5TBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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