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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1508d77bd9117ae0f1bf97efb0fc11f8e60fa96cffd7d99201d3cc5ee689d9' 
  AND token = 'nc9Xh9SR9GGXaTASX49rgZ8paE4W1C+rMv7AtBz/UIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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