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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf304195f0449de4dabb203ae95752fc9146d1f7a43943d705473e72526f305d' 
  AND token = 'bZeLY18i1oJzPdLGghgyfFYEBRESjYlAVCXy1M4MWgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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