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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3346f19a510fa776ba8199f3b72b4f374797893ba537f17f75dcc163843b809' 
  AND token = 'TeeYL9YOLzYs9K5bO6GIqm0Z+ZXWqFCWqMZ5vpvneWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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