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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d08909f68bb1d852d3a86e077ba8a49096ea6f89653de59098c6622712e9f6' 
  AND token = 'GlQidn3nXHGq2iQ+InjlZze6fgBXhR2vWo1iPLtm3+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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