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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c61607a4de796c31ed319e83c90c6ec7953fc6b6e9ccba88f998f51d8aa333d' 
  AND token = 'ovUn4kKpZrVLjaxDYQOQLzEzAvdP3yF0WU4Uy4PYK54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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