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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724d9b948f212b0039dec776fca0f8d451f9be12d7b8f535b2b02e34c8420089' 
  AND token = 'dovRXxkcHxdSRXUt8aH9MkNl7603UIQRW6dUIAg7EmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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