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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2711c3ad06ea97df2b7d9703f625fb977d6c4bfebc2aeaba3bd0b99bfee31e' 
  AND token = 'tZ/XJAqYExtrxokAySyY5ulpx6sN/jSiBLHRGhusTq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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