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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28fb87dd1613d692424b8ed604949fb4b6fce425a9797d35797f1f33587a81d' 
  AND token = 'OHvAz4N/e56FaLI89FosZ+Twe8OGQqyCZcE8MnpNbc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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