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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9338c94160952670213f700f441630da6b2d117e1009ac72a5012e7e1ba0d18b' 
  AND token = 'MfFlwWqxwP0+os5ZdlJNcr+u32q4IEwJkEEzED/5Xik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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