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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55107be0afe4b49006c45e754694e540329075513bfaad0a92a565b85eddbdaf' 
  AND token = 'DSxQ3an/DqWMhmAxj32SSYzHTV43S8OOQaXklomNL8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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