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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f72d51dc5bf1fe484598b14cc4cd376fc061ebecc1138adda5fde5ca5e4524e' 
  AND token = '4JMT8pDAmesKaeayVKKihIYurFk+ss5FPFhtZfwNXOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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