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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1b162d29cba3454c347ff26cf4aa97bd8ab176142f10a0e7d72de09a06c20f' 
  AND token = 'BnN2tLOWIvCb43ow2X4ojOA7O3J+KAdnaj9V9w6k4Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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