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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f821319e3fa8cf147987785b5489bf38b026a9819259910fafb79ec4cb4d8c' 
  AND token = 'N0NxBs0UhvIoCw1DbWLav1aeWTAWJCYi4tcFUSByyUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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