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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e59c433d781482ef996a8d3d280dfe175da7e5065116abd0078543a8989e51' 
  AND token = '9ytI2dSxaJo4iJcY2Y4ieZKJxm7xvJe+8mgwVrXYbbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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