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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0860c5dd3205d6a6e5be51536d3d3b4f00e253db8d3cd6e6753ba10ae5591a' 
  AND token = 'TRqw1tiordWc9iQmnEZcINGZiGoWIyWhS6mkFQGzlvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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