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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eded33349872f2d4e8a8575e8bbd288848323189f27730ea5e1216dd48b1b8db' 
  AND token = 'OToEj6lmICFVcjJVHnmI+vXQJ3hx9Di1ybBZpT7fN4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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