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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85564bc314bf6f6fc7c9d01afdc181e91f5dd85175689e76612154cee0342ee6' 
  AND token = 'LI3u9PyXtDrERTiEdIy9C31yRGiP9wk6O1JrqPH0PiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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