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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b5b73b221353fe66d5eaca2d3548e24384796319ff82f22e7efc4a6ea2fc8e' 
  AND token = 'qieSpf0g7XNfzYdchuITd3wVGiwJimqW0MRbWTUEJbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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