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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3096fd5f40bc51e213c7526a034ea71b8fcc0665a82654b287d359bd05a0ee12' 
  AND token = '0ONRYyj+goYo18qd+XtdUERYhKKdQ4T87aNzK7A4b20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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