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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04313d5bfe2dbc9fcc4557e9b326069dd49e5d8e0e995192567fc3699f71bb6b' 
  AND token = '3YpzIYLIfhGLV6Lpg1MolrQHdmvN/tsMs0EMJsKivmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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