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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723a54c4688e1610fcf9b6ba3ab775e9fc682fe71cf22980b8fb90aa0b7efcbd' 
  AND token = 'RlGUz52NdllCp6DG53JakXb9/MyuhH1dZ7KEfMa2RDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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