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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6961f5435c4323fc877ed431b1811a56627e9b86dea749361ff895cd2a00e039' 
  AND token = '8zfNsPipftzu6MBw8y3+cWkEWsnX0cfUFgZBJ+SPJFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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