SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b1f274c92eab7bb289e563907cf7859c225c0b61fa330a358fbd9c70f288cb' 
  AND token = 'e55Yguhpn+RuXL2hqFPqV1kIXwUx4+RPNeN14UBpEAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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