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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6d143248be3a913c8d7c8e4c15af555b03db4d71eaa87df76f106472733fed' 
  AND token = 'NsovEc1xAzdt1PS0/5ERRnT1Mz3GYinGSsxWExWqLBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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