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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a03714fbaa102821cd3e4ed0a6c73f1d200fa22212cf3b8f30c55aa56906b5' 
  AND token = 'h9oRmOXK+jPgZOLCDszD6YaP7auXirss1lFjMhjqxoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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