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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f83f8251a50cd4d12ff5c3e336051bc59f8acd4b091b9e8c114da1aae32986' 
  AND token = 'BchpEspT59kVH87aHJPnXQTV7UtyZHBNktjDrJOMbZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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