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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed1bacbf694a52f9ca1a5ccbb6ae4a922575271b2e5545cba87c3a3c07c283d' 
  AND token = 'u/Rzd/IUs8Y3sE12xZxXHLpUDAvyLaDIiCtdzT5bO/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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