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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48dacd39b9395a986f1c3fcd5cf867b45f0ad8e27545e52f6e055cd5f17c9f7' 
  AND token = 'Ov6FwHXsW8rbk+JmMLmZDhcFn8IeQxIQxCwDs2ijdrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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