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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12184e1d5a112861513ff8ae440e3b31be3c5af517e94412debad2f7d0ff6dda' 
  AND token = '5AlZc9IZCpXnWizxLQ2YGYzfoCWK7H6YN6YlNSELOuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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