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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920fbdd18b91e48b91efc1c3f2e251eeaca46cc182823ab14d9618bd844d9840' 
  AND token = '65Bd1EbzG0dsX8xF3oM4ZYNxdtBQ+DssDziE+PZOUzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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