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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733494c3e86606ef9a55fde8da3b4fd591ea1f324b73e3706fb88a224bc6e81c' 
  AND token = 'lz+R9bi2LRojcy46zdHuyn1m0ObnMAfQQX3UqssxKd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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