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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508e0b744480ee38bba9383050dc847dceee3ca70b693873db7cea5b04cbba1f' 
  AND token = '4AVisenh1P+LogQ5Npsmj7jO7NseDy0d9Qxr3mgNqiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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