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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74adf3197208a8fa9bfd153c45ae7ac5ff556b4760f177c075044b4cd452381c' 
  AND token = 'k7HgKvZFQPRUzi0o6t+LRk+3v4WLQ93HuEZTKpo/3L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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